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What is the best octane gas for a 2003 Chevrolet Cavalier?

The 2003 Chevrolet Cavalier's owner's manual will specify the recommended octane rating. It's usually going to be regular unleaded (87 octane). Using a higher octane fuel (like mid-grade or premium) won't provide any performance benefit and is simply a waste of money for this car. Using a lower octane fuel *could* cause engine knocking or pinging, which is detrimental to the engine.
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